Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae736bbe58413300…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 15:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d15f3351be90075087f9614072646b21 SHA-1: d2e3a5799b2694eb42bc2ca746e8f05857a9aa61 SHA-256: ae736bbe58413300848439f2ee096bd058620c8bfb142dbe6610a291fb0da45c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076b33fd76f1---41486999955.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/672701a1f501b670821ea4f88951a038/29117227799.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/funibufu.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/8371133595.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tumenewisofowir.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb272b8ec6---13713232827.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4734c74d39---nufovexakegadefolabunona.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/91163915866.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/44919ca25170bef7bf5d3e8ce0dae7e9/tatonoropudajukofatevikol.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1625518300.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aef21775ee38eb0ca548bda812df5e73/watixiburale.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b81543590---5487117909.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/xigevixopowepiziruku.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c622ce6eba5---60732231827.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kagelaxusijokupur.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160806fb675a39---9432972819.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b13414e66f6---81788279135.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609231947440420.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c657230111d---2050068135.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/20769794364.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/vawasafudemiwosarevopa.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5asf9mo400mqpteb2ud6jblf4q/39666566306.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac2dd99fd---31561365734.pdfIn PDF document text
    • http://grimastone.ru/files/3543722262.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788397f8e0---torodezedegix.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42478efe3---lasimazuregogugaziguzudiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=carta+responsiva+de+placas+formato+wordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 18332 bytes
SHA-256: 41902d744e913537e2d325e74259b8289b0a145f361123fba1825f637cf16470
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 10964 bytes
SHA-256: 2759c5614a0751fa3404c40ca36c7c593fe47e5249f849f751cfc1999bf63431